My partner developed T1 as a result of immunotherapy! He has continued to have the immunotherapy treatment and manages his diabetes pretty well. He then also developed adrenal insufficiency and takes 5mg Prednisalone daily. He had to slightly adjust his insulin dose as its a steroid, but no real issues. I think the main thing for diabetics is that immunotherapy can trigger inflammation of pretty much anywhere which gets treated with steroids, which sends blood glucose high. His endocrine team have been great with advice on how to manage it all.